Riveting machine



Aug. 22, 1944. F. MAYER ET AL 2,356,526

RIVETING MACHINE Filed Nov. 12, 1941 1o sheets-sheet 1 Aug.,22, 1944. F. MAYER ETAL RIVETING MACHINE Filed Nov. l2, 1941 lO Sheets-Sheet 2 ...ulihuvl 1T. llll |.l1||1.

Aug. 22, 1944.

F. MAYER ET AL RIVETING MACHINE Filed NOV. l2, 1941 10 Sheets-Sheet 5 Aug. 22, 1944. F. MAYER ET A| 2,356,526

RIVETING MACHINE Aug. 22, 1944 F. MAYER ET AL 2,356,525`

I RIVETING MACHINE I Filed Nov. 12.11941 10 sheets-Shen 5 Aug- 22, '11944. MAYERT A1. 2,356,525

RIVETING MACHINE Filed Nov. l2, 1941 lO Sheets-Sheet 6 Aug. 22, 1944.

Filed NOV.l l2, 1941 ff if T F. MAYER ET AL RIVETING MACHINE 10 Sheets-Sheetl 7 fev Aug 22, 1944f-` F. MAYER ET AL 2,356,526

RIVETING MACHINE Filed Nov. l2, 1941 lO Sheets-Sheet 8 Aug. 22, 1944.

F. MAYER ET AL RIVETING MACHINE Filed Nov. l2, 1941 10 Sheets-Sheet 9 126 27 Fig. 75

133 724 /nenons @MMV/M2 Patented Aug. 242, 1944 v RIVETlNG MACHINE FrledrichMayer and Franz Wopper, Regensburg,

Germany; vested in the Alien todlan Property Cus- Application November 12, 1941,^seriai No. 418,834

In Germany December 19, 1939 16 Claims.

This invention relates to certain improvements regarding the production of flush or countersunk riveted joints and has special reference to riveted joints of the type in l'which metal sheets are conically bent or depressed to form a countei-sunk rivet hole for reception of a countersunk rivet head, while the opposite rivet head is of special shape to conform to the conically projecting complementary portion of the metal sheets.

It is an important object of the present invention to provide means and methods for producing riveted joints of the type referred to which are reliable and can be made with relatively simple tools. High quality of the riveted joints and loyv cost of production are' to be demanded for mass production of such riveted joints, which may be used, e. g., in the manufacture of aircraft parts.

Another object of the .invention is to provide I `means permitting the use of countersunk rivetsof normal type whose countersunk head forms the swage or die head while theY special head conforming to the conically projecting portions in the metal sheets is made as the closingorsnap head.

With these and further objects in view, as may become apparent from the within disclosures, the invention consists not only in theY structures herein pointed out and illustrated bythe drawings, but includes further structures coming with-V in the scope of what hereinafter maybe claimed.

The character of the invention, however, may be best understood by reference to certain of its structural forms, as illustrated by the accompanying drawings in which:

Fig. 1 is a section through a joint to be riveted according to the present invention, as the rivet is being introduced.

Fig. 2 is a similar section ofthe finished riveted joint.'

Fig. 3 is a similar section showing a modified form of closing head.

Fig. 4 is a side view of a sheet riveting machin having the invention applied thereto.

Fig. 5 is a vertical central section of the upper part of the machine, on a larger scale. n

Fig. 6 is a front elevation of the upper part of the machine, on a larger scale. l

Fig. 7 is a vertical central section through thel lower part of the machine.

Fig. 8 is a front elevation of the lower part of the machine. Y Y

Fig. 9 is a horizontal section through the upper part of the machine on line IX-IX of Fig. 6.

Fig. 10 is a vertical section on a still larger scale, showing the upper and lower dies for perforating andV depressing the metal sheets, the parts being shown at the instant immediately before engaging the metal sheets. Y

Fig. 11 is a section like Fig. 10, but showing thel parts in their positions after the perforating and depressing action has been finished.

Fig. 12 is Va vertical section, on the scale of Figs. 10 and 1'1,`through the holder up withv the rivet grip, the depressing matrix which acts as a snap set, and the metal sheets to be riveted, as the rivet is being gripped by the rivet grip.

Fig. 13 is a section the same as Fig. 12, but showing the parts onarrival of the rivet at the riveting point. 4

Fig. 14 is asection similar to Fig.' 13, but showing'the rivet being pushed through the rivet hole inthe sheets. n

jFig.v15 is a section similar to Figs. 12 to 14, but showing the position of 'the'parts after the closing head has been formed, the depressing matrix or snap set being advanced'- with the llingstamp itis gripping the rivet.

moved toits top position. y

Fig. 16 is a section similar to Figs. l2` and 15, showing the position of'the parts at an instant shortly prior to the nishing of the snaphead, the llingstamp of the snap set taking up itsend position in the bore of thedepressing matrix only inthe course of ,the formation of, the snap head. Fig. V1'? is a section similar to Figs.,12 lto '16, but showing a rivet gripofmodied construction, Vas

Fig. 18 is a section A:through the holderfup vand rivet grip as per Fig. ,'17 on, arrival ofthe'frivet under the holder up. ff fr, Fig. 19 is an elevation of thev rivet'tongs. f

Fig. 20 is a vertical central section 'correspond-u ing to that of Fig.A 7, but showing a modified 'form of thelower 'part of the riveting machine, pro vided with two'fsepar'ate driving means for the lling stamp of the depressing matrix or snap set, the organs beingshown in their positions shortly prior to the depressingand perforating operation. Fig. 21 is a section similar to Fig. 20, but showingk the organs in theirpos'itions after the vquick advance of the filling stamp of the depressing matrix. y i

Referringnow to the drawings in greater detail, and rst to Fig.1, itpwill bev noted that the metal sheets I and 2 which are vconically depressed at 3 and perforated at 4 are fitted with an ordinary countersunkfrivet 5 having a plain conically countersunk head 46 `forming the swage or die head. The Closing or snap Y,head is produced at the under sideof sheet 2, by ,clinching or driv ing. and as shown in Figs. 2 and 3 is shaped conicallyzboth at its inner face 1, conforming to the shape of the conical projection in the sheets, and atjits outer face 8. The rivets of Figs. 2 and 3 differ from'each otherregarding the shapeof their closing heads. In the embodiments of Fig. 2 the acute angle of cone 8 is equal to the acute angie a of cone l, the'two angles amounting to about while in the form of Fig. 3 angle a of cone l is again about' 120, while angle of cone B is subre intensivelydiverted`towards" the fsheets to struction -of -ftheo-rivetingv 'too1s,1since 'it' `permitas duce vthe` conicalv bendn'the. Ysheets Ii 'andi-2 lsnap` Vset; vin` ithe sfurtherVV course "of 'the rivet" o operation.

f Eig; 4j is fa.; generahview of:` ;ariveting machine sld ing 'toom inte-'alignmentwiththe Wer-@112 andY with camevdsc 116', against," action ofV "spring pressing'the vsheets at'l3 1 anddbeing coning forming '46, 41 which mbelil pin-Hand slotf'connectior'i ipermits a relative-movement of die 45 with repectito punch '441imited by the length of s1ot4l. nsertedbetween members 43 and 45 is a helica] v'spring 48 which'is so rated as to its tension pressed she sf'been engaged by the depresshe-glatter is stopped from further nt sotha'onlymember 43 with punch viniLa.;Pyflixldrcalpere`riyetng serves as a ,staticrlan'i rive@Vb die.- i T .A {helical y permanenti urg'eS-fi1L1ember v52 .11D- Mounted fon alpini' 55 of memberfZ is a Is'which'jirig. `5 holds avrr'ivet s 'Screwed intomheinner mem cooperates wifhpfl ,Cam disc.: llrmeunted o'nthe from k'end o'f shaft la. Y is rpresentedina... i *As* mug'gs roue-i110 *y portions of "the oper rtion 3 oafm f portion taking np its respective "bottxnf position'. When there is at'rst/'lfted th vthe'rhlling 'stamp 66 lmember' VV45 "forming" the" depressing' A"die for"'i decontact of roller10`with cam` I1 requiresza. re-

adjustment by changing. the= overall length-of! member 65including members 68 and10'.` 'I'ozthisy end, the carrier 68 fortherollerisfthreadedly seatedin member 65, at 16. The'handwhee'l63" is formed with a toothed portion11 rn'eslfiingwith`-k a'pinion. 19 mounted on a verticalshaft 18`which.

through. a toothed wheel 80 of considerable width`v transmits theirotationto atoothed'rim BI ,on'carV`` rier 68, thereby screwing the-'latterrinore'or lesszn Owing:

into the threaded: bore offm'ember 65. to the large width of toothed. wheel 80lperma'- nent meshingthereof rwiththe toothed rim: 0| is" ensured irrespective of the-vertical slidingof the toothed rim Y8| causedby rotation of cam disc |1.'

The forked bearing member 69 of roller 10iv is shaped to overhangcam I1 slightlyat its sides,`

so as to be heldA against participationv in the turn'- ing motionof its carrier 68.-

The depressing. matrix. 53 is surrounded byfanf annular holding downmember k8 3 which is .forced-i upwards by a helicalspring 82V.' 1

Figs. Sand 9 of the drawings4 illustrate also a device combinedrwithV the. riveting-machine and serving to produce the'countersunk rivets.: Thefrivetsare made ofwire rods-84; A single wirevv` rod is fedthrough the channel 85`-and the bore.:

86 inthe'machineframe, byemeans of a feeder 81 whose forwardxendabuts` the extreme-end of..r

the Wire rod 84 While'its opposite? end is shaped as a ring 88-for anchorage of one end of` a helical springz89 whose other end-is secured 'to thecasing of the machine'by meansy of `aheaded screw` 90, thereby .exerting upon` the feeder 81` a-.pull towards the center offthe machine. 81 transmits this force on the wire rod 84 which thus `is permanently acted uponby a force-tend;-V

.ing to advance it, andzforcedthrough theboreJ 85 of the stationary member 9 |I as well as through the bore 92 of member 93"secured on member 9|, into engagement. with a. slide94 which is The "feeder" lower end engaging into a recess II1 of the Aoftarroller/I01 on .its end vwithfthe earn disc |08.

secured. ont shaft |09-fand shaped as shown in Fig. 6. Whenaroller I0-1of`fpre'ssing die |03 is operatediby'jthecam.' die|03 is advanced towards the T severedLendofwire rod. 84.r against action of spring |06; deforming; the extreme end of the severed'length of wire to a conical swage head in .the-conically-recessed die |I0von slide 94.

The -undriven or uncliiichedY rivet thus vfinished heldzinit's inoperativeposition by a helical spring III andfoperatedby action. of a-two-armed lever ll'3'l'fulcrumedf on' a:.stati'onaryAIV portion ofl the machine at II2y andfV controlled by engagement of rits roller II 4l with acam II`5 on'shaft I I6, its

thickeriportionjofejector vI |14;` The ejector advances'thernished rivet vso far that it can be seized by the -gripI |8,.Fig. 12.

Thefshafts. I09`and Ilfcarrying the cam discs system. I2. Thesprings 50 and 82v are compressed horizontally` slidable on. member.` 93"'from..the-fI iront to the rear'andvice versa, under-control of a cam disc 96` whichjismounted onvshaft II6 and. operates af. two-armed lever: |00 which'. is

mounted on a` stationary 'pivotSLi and by 'means i of a roller 98 on itsupper arm engages carni disc. 96 while its lower arm engages into a slot 99 of slide 94. The vcam. discx96 cooperates witha com.-

pression spring.. |0I,. whoseirear. end is seated-:im

a stationary recess of the machinecasing `While its front end actsupontherear end of slide-94.

Slide 94fhas abore I02which. in'V one endposi tionzof the slide is* locatedbetween the-pressure.A

die |03 andthe'ejectorIM, Fig. 9, an'd'inxthe other endposition of .the slide is; located. above'.

bore 92 of .member 93; this being. the position.

which in thezcourseof"thecomplete cycle of `.op.r erations for finishing one. rivet'is taken up; first; The wire rod 84 in'thisy case is advancedjbyf-thefeeder -81 until it strikes' against a'stationary stopN |05 whichthus'defines the length. of feed and ensures the formation cfa rivet ofv predetermined.`V`

length.

Afteradvanceof thefwire rod84 the slidef94.

is urged forward: by cam. disc I96,-'v the .two `bores |02V and 92 exerting. a. shearing 'action upon' wireA 84' andicutting'offv theadVanCedlength of wire...

The severed length of iwireis taken'along by the. advancing slide 94 andbrought under thefrivet" pressing die |03provided ontheoutsideof.` theV machine casing in the-slide 33 carrying the toolsv I3 and I4, in a horizontal. position. Through a:

helical spring |06 die |03 is-pressedr outwards' fromfthe center of the machine, for engagement by` thedownward .motion of the Ydepressing die 45,V andfthe4 conlcally projecting portion thereof approaches the conical recessV 51 of the depressing matrix 58, thereby deforming the portions of sheets Iandy 2 between: themembers 49 and 83 into aconlcal. shape. TheI downward stroke of die 45 isidenedl by engagement of sheet 2 with thefconical` -walls of vvrecess: 51;. only the punch 44 advancing: further during. the further downward strokei of.-tool.1|3, therebyr striking'- against the sheets I, 2,'. and perforating the same, as shown in Fig. 1l. Thesmall'. disks I|9 punched out fall J uporra :guide fsheet" I 2 0 :arranged inthe'fde'p'ressing die 58 in an 4inclined@ position,v sliding outwards thereon;

After the depressing and perforating operations have'been finished, the` tool ,I3 is retracted, and

slide/'.33 L is moved.- rearwardsto bring tool I4 un'- derdrivingcam I6,- Fig. 5.. Wen this tool I4 is moveddownards,4 Fig. 12, the hub 2| of rivet gripil lsfpivoted'at 55fat rst contacts a friction surface. I 22,.. with the result" that they rivet grip II Bisswungcl'ockwise, the extreme end of grip I I8 'engaging'theunclinched rivet ,5 which hasiust been'made and. in this'moment is ejected from slide =94 by" ejector |04. grlp'IIB'is counteractedby a' helical spring |23 YWhose extreme ends are: anchored at the grip andfinftheinterior oftool I4',`V respectively.

During" the furtherl downward. movement ofr tool I4"thefswingingmotion of the rivet grip II8 y iscompleted bycooperationof hub |2I with the frictional. surface |22.; Fig, 13 represents the positionof the'membersfasfthe rivet grip has just brought the-rivet 5 torav pointV above rivet hole 4-of.- sheets. |,v.2. During-.furtherdownward motion'hub` |2| disengages lthe frictional surface |22, Fig.; 14;v wherebyfspring' |23 i comes into effect, pulling'the arm of grip I|8..upwards with a considerable acceleration'. The rivet 5 in this instant-has'entered the ho1e-4'ofsheets |l 2, and is now pushed `down' by tool |41 through the rivet The Iswinging motion of l of the holder-on 53.

hole until its swage head'Gl engages the wall of the conical recess 3 of sheets I and 2.

The holding-on member 53 which is now in contact with sheet I presses the holding'down clamp 83 downwards against action of spring 82, Fig. 15, whereby the shank of rivet 5 protruding beyond the lower edge of hole 4 strikes against the depressing matrix 58 which now acts as a snap set, itscentral bore being filledV up by the filling stamp 6B which in its upward motion has moved the guide sheet aside. As the rivet shank engages the snap set 58, S6, the snap head with its two conical faces 1 and 8 is formed. The two conical faces 1 and' thus formed have equal cone angles.

By way of alternative, the lower tool system |2 of the riveting machine may act in a manner somewhat different from that described with reference to Fig. l5, so as to provide another cooperation of the filling stamp 65 with the depressing matrix 58. InFig. 15`it has been assumed that the filling stamp 66 on engagement of the shank of rivet 5 withthe snap set already takes up that position in which it fills up the boreV of the snap set completely. In Fig. 16 another kind i of cooperation has been assumed as between the members 58 and 5S. When the shank of the rivet strikes against the snap set 58 as the holder-on 53 goes down, the filling stamp is not yet in its Aupper end' position in the bore of the snap set, but in a lower position, so that the rivet shank at iirst enters the bore of snapset 58, while the complete filling up by the filling stamp 66 of this bore takes place only in the further course of the clinching operation. 'Ihis mode of operation of the members 58 and 66 indeed requires a greater force than that described with referencel to Fig. 15 but it offers the advantage that the shankV of rivet 5'is clinched or upset more intensively. which is a desirable effect.

Figs. 1'1 to 19 represent 'a modified form of the downward motion of tool I4 strikes against a stationary stop |39, thereby causing the grip II8 to carry out a clockwise swinging motion.

Since the rivet 5 has to be placed under the holder-on body 53 of tool I4 in such a manner that the upper face of its swage head touches or nearly touches the front face thereof, the stop member |28 is in the way of the rivet when itis intended to place the same under the holderon. It must be capable of receding `to permit this operation. 'I'o this end, the grip is provided with the swingable arm |24 on which stop |28 is mounted. When moving the rivet under member 53, the lower free end of arm |24 will strike against member 53, thereby receding against action of springs |26. When the tool I4 has reached the position shown in Fig. 18, rivet 5 already has been introduced slightly into the rivet hole 4 so that itV may be left alone with the holder-on member 53 which continues to move. Grip ||8 therefore can disengage itself and return to its initial position, under action of helical spring |23 which is now allowed to act since pawl |31 has left the reach of the stationary stop |39. The bevelled lower face |40 of stop |39, permits upward swinging of grip ||8 and pawl |31 in an anticlockwise direction. At the rivet grip ||8 which is connected with tool I4.

The idea underlying this modified construction of the rivet grip is to provide a safeguard to ensure 'that the rivets always take up the correct position in the rivet grip and troubles are reliably excluded when placingv the rivets under the face To this end, a separate arm |24 is mounted to swing on a pin |25 of the main body of the grip IIB andinfluenced towards a stop |21 of the main grip body by a spring arrangement |26.v n

This arm |24 of grip ||8 at its forward end carries a ste-p plate |28 which is mounted on a guide rod |29 and pressed outwards by a helical spring |30. When it does not meet with resistance on its `outer face, plate |28 is advanced until pin |3| at the rear `end of rod |29 strikes against washer |32, but it is capable of yielding against action of spring |30 when a rivet is ejected by ejector |04 from slide 94. After rivet 5 by further motion of grip I8 has beenremoved from the reach of slide 94, spring |30 by means of plate |28 advances the rivet until its swage head comes to lie on the inner face of the grip tongs |33. In this manner it is ensured that all consecutive rivets are seated in the same position in the grip tongs, which as seen from Fig. 19 consist oi two relatively swingable arms |34, |35, mounted on a pin |36 and compressed by a spring (not shown),

In the embodiment shown in Figs. 17 to 19 the swinging motion of the main grip body I|8 is caused by a pawl |31 which is swingable on a pivot |38 in the hub portion |2| andin the beginning of this return swinging motion spring |23 is supported by the springs |28, until arm |24 has reengaged stop pin |21. The upward stroke of tool I4 is not impeded by pawl |31 and `stop |39 since pawl I 31 is capable of receding or-yielding with respect to stop |39 towards the interior of tool I4.

Figs. 20 and 21 illustrate a modified form of the lower tool system, the changes relating to the con'struction of the filling stamp 6B and its drive. It has been found that in case of inattention on the part of the operator of the machine a displacement of the sheets to be riveted with respect to the lower tool system may easily occur in the interval between the operations of depressing and perforating the sheets and the real riveting operation, whereby disturbances may be caused. This possible defect is eliminated in the construction shown in Figs. 20 and 21 in such a manner that the filling stamp filling up the bore of the depressing matrix is raised already during the return of the perforating punch of'the upper tool system, following this punch and passing through the perforated sheets, thereby holding the same in their correct positions until it recedes during the downward motion of the holder-on with the rivet, now taking up the position required for the riveting operation.

It will be understood that the filling stamp in this case has to carry out a quick motion with small force in the first phase of the cycle of operations and a slower motion with great force in the second phase thereof. These contradicting requirements are fulfilled in the embodiment of Figs. 20 and 21 by the provision of two driving cams for the filling stamp. One of said cams lying in the working axis actuates the filling stamp directly, while the other one acts upon the stamp through a lever arrangement. The guiding portion of the filling stamp is divided at |42 into two parts 65 and |43. The cam disc I1 corresponding to that of Figs. 7 and 9 through roller 10 and roller carrier 68, as well as through the lower part |43 and the upper part 65 acts directly upon the filling stamp 66. The free end of a single-armed lever |45 pivoted at |46 and engaging into a recess |44 of the upper cam. disc` l1 in'affstraight direction@ guidingportlon 6 5 cooperates by its face Uil with a"lifter or Vslide I 4 8 which'` is guided in casing '64, itslowerendby. means of a roller |49 engaginga second camdisc "|50, under action of a helical spring ISI;A The l`ifter` l48r is secured against turning by a portion [5250i quadrangula'r.

cross'section. .Y

When the rollerv 1'49r'un's up onf'cam v50, the lifter T48 is lifted, raising lever 45,al'so.v lIn consequence of the lever ratio the freefendof'the leverftravelsthrough' a Vrelatively long way. This isalso true forthellling.stamp with its guiding p'ortionwBBQwhich is lifted olfrorn. the lower portion' N3, 'the `filling stanlplli thereby vpassing' tl'lro'ugh 'theborel of the depressing'matrix or snap set 58 and rthe hole 4 of sheets l and 2, l

Fig. '21, and securing the sheets .in positionwith `respect tothe lowertoolsystemf Asfth'e tool .l4

with 'the holder-on 5,3 and'the rivet moves-down, thelling 's tamp 66 yields," clearinghole llz Its return motion vcornes to astan'dstill' when its upper end `face has reached `the upper v end of bore l`6`I "of .the depressingfmatrix 58'y which is lifted 'by the. cam 'disc l1, whereby .the surface M2 "of Y memlier |43 `approaches thebottorn face |42'of member: 65.' `As member 65 ,contacts member" M3; the"depressing'matrix'S"and the filling stamp L66 ar, emove`dOnjointly.` The force oc-v curring at' thellingstamp '66 when .c linching vthe closing 'head of the rivet is transmitted to the 'In jconsequence o`f the transmission 4through lever vm5 large strokesofihe filling stamp as can be attained Awith A.cam curves. of moderate slope.` "11', I

` 'Ih'epossibilityofnfered according to the present invention of usingrivets having anormalconical sw'age head oners various ,additional advantages. Where riveted joints are made on aircraft parts theswage headls usuallyfloeatel'at the outside..

As is'jwell known, the outsid'eoi v aircraft.parts in; order Sto attain'iavourable aerodynamic rrconl diti'ons must be made", as smoothV as possible, avoiding projections anlmjrecesses ,It fol1ows that for making.. eeu'ntesnk riveted joints.- on

aircraft parts" it is important togpress the counare sufficient `to close theroof-shaped or double conesnaphead.,

The provisionof the vupper tool system in a movable slidefor cooperationwith aystationary lower. tool system olersthe vadvantage that the machine .is readily: ad table.I toi, theJ varying shapes' of the workplaces, e,..,g.,. .bodieshaving a 'nsh` surface on one s i'ieand4 large projecting portions* for, instance V stifening .ribs,. on their opposite side. f-

f f vThe method andapparatus of the presentv inve'rl'tion"havel been fdescribedffin detail with. refercnce to specific embodiments. .-It is to ,beunderpunch'l in the perforating .operatiomjand a holder-on tool operablefrom'the ,same sideas said depressing die andy cooperatingfwith said matrix which is adapted tqact as a ysnapfhead die` in the riveting. operation, forA producing a snap head having-inner arl' d..outer conical: faces,

and tothis end isprovidevdfwitha filling stamp adapted tollup its Central bore during theriveting operation, for usingsaidlmatrix yas a snap head die.

2.]A` sheet riveting v .machinefcomprising in f combination a depressing die and a complementary matrix for producing conicaldepresslons in thesheets to be riveted, apunch cooperating with said. matrix for producing a rivet hole in pressing die and cooperating withy saidv matrix terslink `-head with sharp., edges, in ofrder. to .fill

up the recess in the dpressedlsheetsicompletely; The sharper the 'I edges', of -theswage. head are made the'more accurately the recesscan-be lled up. [The sharp pressing oi fitheswage head however 're'quiredja Hcc'ns'ide'rable. arr'loulltoiI pressing which as experience has vtaught isv higher lthan that required `for producingtheysnap heaclfwhich ls conially fshapedlonboth sides; Thereforc, if

the countersunk headfisfforrned inthe riveting, operation, asa snapheadlarge .forcesfhave to be"x produced by ythe riveting machine .and Vrthe.

same accordinglyfmustfbe of heavy. construction.l

The large forces to be apnliedfdnvolve therisk of jammingfthe s lleet s. Thefdangergis particulalfly, important with thin ight metal sheets. v r flll'e above mentionedfdra-Wbacks are avoided img al central.,bore .for -cooperatl'on with; saidpnnch in theperforat ing. operation, a holder-on present inventio n vSince--itgserves aslaswagel head, the` countersllnk head can ,be made 'neatly I in a. separate operation fromy the. real riveting prccessvby special rivet producing:v devices.

is hush atrtheoutsideisfensured. The danger of jamming the sheets to be riveted is avoided by the use of moderate clinching pressures. which thefcentel. 'of each depression, said matriX-hav ing a central boreiorlcooperation with said p urlchin theperforating operation, a l'lolderfon tool yoperable `fromr thefsame sideas. said de-..

which. is adapted to act as a snapstation asnap head having inner andouterconica'l face s, and

tolthi's end is vprovided with a llingstamp mov-vv able infit'sv central bore,l and controlling means "for moving said, ii/llingstamp in such amanner.,

that said centralbore duringthe whole clinching;v operation A is completelyelled up :on `its .end

facingthe rivet.

3, A sheet `riveting .machine-y comprising in combination a depressing die and a complementary, matrix `for,,producing conical `depressions in the vsheetsfto be riveted, a punch cooperatingwith said matrig for .producing a rivet. hole..in'

the center of'geachdepression,-said matrixl havtool` .operableirom .the same .side vv-asA said de pressing die .and cooperating-with said matrix'- ywhiclfi .is adapted ,to act yas a; snaphead die in -the;rivetin g operation. .for-producing asnap -lteadv havilvlg 'innel-and outer conicalfaces. and to The realrivetingv machine, can .be vfofnlighterfcon' struction,v since lit ihas 1 to 'produce vsmaller forces only to form the snapv head Withftwolconical' 4faces;j r lhe prod uctionof a riveted joint which this endlfisprovided'with-a filling stamp movable:

in'r.litswce ntral; bore, and Y:controlling means for mQYIDg of the riveting operation.

isaid filling stamp .irlisuch l'el-'manner that at-the lbeginningv` of the, riveting .cperationf'it `does l not completely .iillv up, said? central borek at" its"l facing .'the: rivet. whileq,it-1-isl-advancedito its end h.I=DQS.tiOr1 iin said central :bore'inf the i course* '4. A sheet *riveting `machine comprising in combination a machlnemframe. an upper tool system ancla-lower tool system, the upper tool'system comprising a slide .transversely movable in said frame and carrying a depressing die for producing conicaldepres'sions in. the sheets to'be riveted, a punch for producing a rivet hole in thevcenter of each depression, and a holder-*on tool, saidv parts being alternately movable int'o Working position by shifting said slide, and the lower tool system being stationarily arranged and comprising a complementary matrix for said depressing die provided with a central bore for cooperation with said punch, and av lling stamp movable in said central bore for filling up said central bore during the riveting operation in which said matrix is used as a snap set. y

5. A sheet riveting machine comprising in combinationl a machine frame, an upper tool` system and 'a lower tool system, the upper tool nately movable into working position by shifting said slide, andthe lower tool system being stationarily arranged and comprising a complementary matrix for said depressing die `provided with a central bore for-cooperation with said punch, and a lling stamp movable in said central bore for filling up said central bore during the riveting operation in which said matrixyis used asa snap set. u

6. A vsheet riveting machine as claimed in claim 5, comprising also a stop member defining the position of the rivet in the rivet grip.

7. A sheet riveting machine asclaimed in claim 5, comprising also a stop memberjmovably mounted on the swingable arm' and held resiliently in its working position.

`8. A sheet 'riveting machine as claimed in claimY 5, comprising also a stop membermovablymounted on the swingable a'rm and held resiliently in its working position to be capable of yielding in an axial .direction of the rivet in the rivet grip.

9. A sheet riveting machine as yclaimed in claim 5, `comprising also a stationary stop member for the swingable arm, the portion of the swingable arm which cooperates 'with said stop member being mountedv to yield in one direction after the l manner of a paWl," so that said portion may give holder-on tool. v

`10. 'A sheet riveting machine comprising in combination adepressing die and a complemenway for said stop member during return of the tary matrix for Vproducing; conical depressions inY the sheets to be riveted, a punch cooperating with said matrix for producing a rivet hole in the center of each depression, said matrix having a central bore for cooperation with said punch in the per'foratng operation, a Vholder-on tool operable from the same side as saiddepressing die and cooperating with said matrix `which is adapted to act as a snap head die in the riveting operation, for producing a snap head having inner and outer conical faces, and to this end is provided with a filling stamp movable in itscentral bore, and controlling means for vmoving said vfilling stamp beclaim 10, comprising two separate controlling means for the lling stamp for alternately moving the lling stamp in different speeds.

12. A sheet riveting machine as claimed in claimflO, comprising also `a lever transmission and two separate cam discs arranged side by side, one of said cam discs lying in the center axis of the iilling stamp for operating it directly, while the second cam disc cooperates with said lever transmission to move. the lling stamp at higher speed. y

13. A sheet riveting machine as claimed in claim 10, comprising also a lever transmission and two separate cam discs arranged side by side, the illling stamp being divided across its axis into two parts and one of said cam discs lying in the center axis of the nl ling stamp for operating it directly, while the 'second cam disc cooperates` with said lever transmission to move that part of the filling stamp only whichfaces the work piece.

14. A sheet riveting machine as claimed in claim 4 including a plurality of simultaneously driven cam lshafts-cam means on one shaft for actuating the depressing die and the punch and holder-on-tool kof the upper tool system, cam means on another shaft for actuating the matrix and the filling stamp of the lower tool system, lever means for moving said slide, and cam means on still another shaft for actuating said lever means to cause movement of said slide.

15. Asheet riveting machine as claimed in claim 4 including rotatably mounted cam means for actuating the depressing die and the punch and holder-on-tool of the upper tool system, other rotatably mountedcam means for actuating theA matrix and lling stamp of the lower tool system, lever meansfor moving said slide to align one of the tools of the upper tool system with the lower tool' system, still other 'rotatably mounted cam means for actuating said lever means to cause movement of the slide, and means forsimultaneously rotating all of said cam means, sa'd various cam means being arrangedto cause actuation of the members of said tool system in succession' 'to effect the clinching of arivet.

16.- A sheet riveting machine as claimed in claim 5 including means for forming rivets from rivet Astock fed to said forming means, the forming means placing a formed rivet in `position for engagement with the rivet grip, rotatably mounted cam means for actuating the depressing die,

punch and holder-on-tooloi' the upper tool system`, other rotatably mounted cam means for actool system, lever means for moving said slide to V 1 align one of the tools of the upper tool system with the lower tool system, other rotatably mounted cam means for actuating said lever means to cause movement of the slide, still other rotatably mounted cammeans and lever means for .actuating said rivet forming means, and means for simultaneously rotating all of said cam means, the various cam means being' arranged to eiect a cycle of operationl of the rivet forming means and tool. systems and slide wherein a rivet is formed, inserted in a perforation punched in,.the sheets and is clinched. f

FRIEDRICH MAYER. A FRANZ WOPPER. 

